From 788a7914ad43380d31efed1c4d14b5f2c466a764 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Fri, 12 Sep 2014 16:40:21 -0400 Subject: nfsd: set and test NFSD4_CLIENT_STABLE bit to reduce nfsdcltrack upcalls The nfsdcltrack upcall doesn't utilize the NFSD4_CLIENT_STABLE flag, which basically results in an upcall every time we call into the client tracking ops. Change it to set this bit on a successful "check" or "create" request, and clear it on a "remove" request. Also, check to see if that bit is set before upcalling on a "check" or "remove" request, and skip upcalling appropriately, depending on its state. Signed-off-by: Jeff Layton --- fs/nfsd/nfs4recover.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) (limited to 'fs/nfsd') diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c index bf3a3575d060..d0fc003d130a 100644 --- a/fs/nfsd/nfs4recover.c +++ b/fs/nfsd/nfs4recover.c @@ -1296,7 +1296,8 @@ nfsd4_umh_cltrack_create(struct nfs4_client *clp) grace_start = nfsd4_cltrack_grace_start(nn->boot_time); nfsd4_cltrack_upcall_lock(clp); - nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start); + if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start)) + set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); nfsd4_cltrack_upcall_unlock(clp); kfree(has_session); @@ -1309,6 +1310,9 @@ nfsd4_umh_cltrack_remove(struct nfs4_client *clp) { char *hexid; + if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) + return; + hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); if (!hexid) { dprintk("%s: can't allocate memory for upcall!\n", __func__); @@ -1316,7 +1320,9 @@ nfsd4_umh_cltrack_remove(struct nfs4_client *clp) } nfsd4_cltrack_upcall_lock(clp); - nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL); + if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) && + nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0) + clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); nfsd4_cltrack_upcall_unlock(clp); kfree(hexid); @@ -1328,6 +1334,9 @@ nfsd4_umh_cltrack_check(struct nfs4_client *clp) int ret; char *hexid, *has_session, *legacy; + if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) + return 0; + hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); if (!hexid) { dprintk("%s: can't allocate memory for upcall!\n", __func__); @@ -1338,9 +1347,14 @@ nfsd4_umh_cltrack_check(struct nfs4_client *clp) legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name); nfsd4_cltrack_upcall_lock(clp); - ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy); + if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) { + ret = 0; + } else { + ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy); + if (ret == 0) + set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); + } nfsd4_cltrack_upcall_unlock(clp); - kfree(has_session); kfree(legacy); kfree(hexid); -- cgit v1.2.3